Bolt



April. 12, 1927. y 1,624,767'

w. SCHWEMLEIN L BOLT,

Filed Dec. 29, 1924 f WILL/HM HwEMLE/N Patented Apr. 12, 1927.

j UNITED STATES PATIENT oFFICE. l

WILLIAM SCHWEMLEIN, OF PARKERSBURG, WEST VIRGINIA, ASSIGNOR T THE PARKERSBURG RIG & REEL COMPANY, OF PARKER-SBURG, WEST VIRGINIA, A. COR- PORATION OF WEST VIRGINIA.

BOLT.

Application mea December `29, 1924. serial No. 758,763.

V in the provision of a lug. arranged onfthe vunder side of the head of they bolt of substantially the same width as the bolt diameter yand extending to the outer edge of the bolt head. Heretofore, it has been customary to f employlock Washers in connection with bolts on derricks. While a lool; washer will pre-v vent the nut from turning with respect to the derrick member, it does not provide means for retaining the bolt in its desired posit-ion. By employing the bolt forming .the subject matter lof this invention, the lug may be arranged in a slot in the derrick girt or brace to prevent it from turning and the nut tightened with a single wrench. I am aware that in the type of bolt known as a track bolt, it has been proposed` to provide a projection' or lug to be received in a slot or recess to prevent the bolt from turning, but it the ordinary construction of track bolt, the line of pull between the'nut and the bolt is some distancefbeyond the point that n would be fiXed by an ordinary machine bolt and it isy not particularly adapted for use in derrick fittings.

In' the yaccompanying drawings, I have shown one embodiment of the invention: In

tions and these sections are connected to each vother byy suitable fastening means. .Ref-

erence nu1neral2 designates horizontal braces and 3 designates diagonalv girts. The ends of these members are provided with slots 4. Where the leg sections are connected to each other, it is customary to provide a splicefplate posite side. y

j The bolt forming the subject matter of the rpresent invention consists of a threaded portion 7 and a head8. Adjacent the under side of' the head, there is provided a lug or'projection 9 which is of substantially the-same width as the diameter of the bolt (see Figure 3). When the bolt isl assembled, as shown in Figure 2 of the drawings, this lug is arranged in the 'slot 4; and prevents the4 bolty from turning. A lock washer 10 is placed on 'the opposite end of thefbolt and a nut 171 then tightened on the bolt. .i y'

It vwill be apparent that .the provisiony of the lug 9 permits a nut tobesecurely tightened with the useof onlya single wrench. In the ordinary type of bolt, whichv is free to turn, it is necessary to hold the head of the bolt with one wrench and tighten the nut with a second wrench, which is often veryl difiicult to do in view ofthe position of the yvarious parts of' the derrick and the inaccessibility of the bolt head.v .v

Itis to be understood that the form of'myinventionherewith 'shown and described is to be taken as a preferred example of the same, andthat various changes in the shape, size, and arrangementof parts maybe re-v sorted to without departing from the spirit of the invention or the scope of the subjoined claim.v f

i I claim: l f

A bolt comprising a threaded portion, a head formed on oneend of said threaded portion, and a projection extending from one side only of said'jthreaded portion adjacent the under side of said head, said projection being of a widthequal to the diam-- 5 on one side and a spliceangle 6 on the opsok eter of the threaded portion of said bolt, and l the sides of said projection being parallel 'to each other. of a'plurality of sections known as. leg seci In testimony whereof, I laliixl my signature.

WILLIAM SCHWEMLEIN. 

